feat(crypto): Add RoomSettings::encrypt_state_events and feature gate

Signed-off-by: Skye Elliot <[email protected]>

Author: kaylendog

crates/matrix-sdk-crypto/Cargo.toml

@@ -18,6 +18,7 @@ rustdoc-args = ["--cfg", "docsrs", "--generate-link-to-definition"]
 default = []
 automatic-room-key-forwarding = []
 experimental-send-custom-to-device = []
+experimental-encrypted-state-events = []
 js = ["ruma/js", "vodozemac/js", "matrix-sdk-common/js"]
 qrcode = ["dep:matrix-sdk-qrcode"]
 experimental-algorithms = []

crates/matrix-sdk-crypto/src/machine/tests/room_settings.rs

@@ -23,6 +23,8 @@ async fn test_stores_and_returns_room_settings() {
 
     let settings = RoomSettings {
         algorithm: EventEncryptionAlgorithm::MegolmV1AesSha2,
+        #[cfg(feature = "experimental-encrypted-state-events")]
+        encrypt_state_events: false,
         only_allow_trusted_devices: true,
         session_rotation_period: Some(Duration::from_secs(10)),
         session_rotation_period_messages: Some(1234),

crates/matrix-sdk-crypto/src/store/integration_tests.rs

@@ -1163,6 +1163,8 @@ macro_rules! cryptostore_integration_tests {
                 let room_1 = room_id!("!test_1:localhost");
                 let settings_1 = RoomSettings {
                     algorithm: EventEncryptionAlgorithm::MegolmV1AesSha2,
+                    #[cfg(feature = "experimental-encrypted-state-events")]
+                    encrypt_state_events: false,
                     only_allow_trusted_devices: true,
                     session_rotation_period: Some(Duration::from_secs(10)),
                     session_rotation_period_messages: Some(123),

crates/matrix-sdk-crypto/src/store/types.rs

@@ -414,6 +414,11 @@ pub struct RoomSettings {
     /// The encryption algorithm that should be used in the room.
     pub algorithm: EventEncryptionAlgorithm,
 
+    /// Whether state event encryption is enabled.
+    #[cfg(feature = "experimental-encrypted-state-events")]
+    #[serde(default)]
+    pub encrypt_state_events: bool,
+
     /// Should untrusted devices receive the room key, or should they be
     /// excluded from the conversation.
     pub only_allow_trusted_devices: bool,
@@ -431,6 +436,8 @@ impl Default for RoomSettings {
     fn default() -> Self {
         Self {
             algorithm: EventEncryptionAlgorithm::MegolmV1AesSha2,
+            #[cfg(feature = "experimental-encrypted-state-events")]
+            encrypt_state_events: false,
             only_allow_trusted_devices: false,
             session_rotation_period: None,
             session_rotation_period_messages: None,